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Jan 29 VH

 
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Clement



Joined: 24 Apr 2006
Posts: 1111
Location: Dar es Salaam Tanzania

PostPosted: Wed Jan 28, 2015 10:06 pm    Post subject: Jan 29 VH Reply with quote

Code:

+----------+--------+----------+
| 14  9 14 | 2  6 3 | 5  8  7  |
| 3   2 8  | 9  5 7 | 16 46 14 |
| 6   7 5  | 8  4 1 | 9  3  2  |
+----------+--------+----------+
| 9   8 7  | 6  2 4 | 3  1  5  |
| 2   4 3  | 5  1 8 | 7  9  6  |
| 5   1 6  | 3  7 9 | 4  2  8  |
+----------+--------+----------+
| 17  5 9  | 4  8 2 | 16 67 3  |
| 8   6 14 | *17 3 5 | 2  #47 9  |
| 147 3 2  | 7-1 9 6 | 8  5  *14 |
+----------+--------+----------+
XY-Wing 47-1 pivoted in r8c8; r9c4<>1; stte
Also BUG+1; r9c1=1
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hughwill



Joined: 05 Apr 2010
Posts: 424
Location: Birmingham UK

PostPosted: Thu Jan 29, 2015 9:48 am    Post subject: Jan 29 VH Reply with quote

Code:

+----------+--------+----------+
| 14  9 14 | 2  6 3 | 5  8  7  |
| 3   2 8  | 9  5 7 | 16 46 14 |
| 6   7 5  | 8  4 1 | 9  3  2  |
+----------+--------+----------+
| 9   8 7  | 6  2 4 | 3  1  5  |
| 2   4 3  | 5  1 8 | 7  9  6  |
| 5   1 6  | 3  7 9 | 4  2  8  |
+----------+--------+----------+
| 17  5 9  | 4  8 2 | 16 67 3  |
| 8   6 14 | 17 3 5 | 2  47 9  |
| 147 3 2  | 17 9 6 | 8  5  14 |
+----------+--------+----------+

Play this puzzle online at the Daily Sudoku site

There's a second one-step 147 XY-Wing pivoted on r8c3. (Too many basics
and too little VH for my liking, but I suppose we should be thankful for the
few VHs that the software has produced in 2015.)
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George Woods



Joined: 28 Mar 2006
Posts: 304
Location: Dorset UK

PostPosted: Fri Jan 30, 2015 11:58 am    Post subject: alternately Reply with quote

Can't remember what it is called BUT every unfilled cell has double candidate bar 1 in box 7 . the forgotten rule is "set this to the value common to the triad" i.e in this example r9c1 =1 and this solves it
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hughwill



Joined: 05 Apr 2010
Posts: 424
Location: Birmingham UK

PostPosted: Fri Jan 30, 2015 12:09 pm    Post subject: Re: alternately Reply with quote

George Woods wrote:
Can't remember what it is called BUT every unfilled cell has double candidate bar 1 in box 7 . the forgotten rule is "set this to the value common to the triad" i.e in this example r9c1 =1 and this solves it


It's the BUG+1 I think. I notice there's also a 17 W-Wing> r8c3=4 which sets it (or is it a skyscraper....?)
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